One photo immediately came to mind when I read the Weekly Prompts: Unusual prompt.
It was this photo of a leucistic juvenile Great Spotted Woodpecker. Leucism is a lack of dark pigmentation making the affected species look a little like an albino. The pale brown areas on the birds head would normally be black.
Then I thought about this photo. It shows a male Black-throated Blue Warbler pretending it’s an Oriole by eating the grape jelly in an Oriole feeder. As a member of the Wood Warbler family, or New World Warbler family depending on which reference you use, it normally feeds on insects.